Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

Once the largest unsupported dome in the world, beating out the Pantheon and St Peters in Rome.

"The Donut" was built as part of an expensive, ill-fated engineering endeavor.

With lush plants and flowers, huge trees, ponds, and hidden monuments, this place feels a bit like discovering Narnia.

Each year a new straw behemoth is born.

One of the largest mechanical models of the solar system in the world.

Two women with a flair for both adventure and artful clutter created this singular round home.

A preserved 18th century steel factory.

This chain of artificial lakes was an ideal test ground for the aircraft that would carry the "bouncing bombs" used by the WWII "Dambusters" squad.

An abandoned 18th century manse looks like something out of an Indiana Jones movie.

Detailed sandstone carvings show an array of symbolism and adorable animals.

Every hour on the hour a naked heroine and her leering foil appear from this giant cuckoo clock.

A quartet of rusting satellite goliaths are all that remain of a communication network that protected Britain from German and Russian air strikes.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

A miniature village mimics the surrounding buildings so well it includes itself.

An extraordinary library and archive dedicated to the history of the Arctic and Antarctic poles.

These Roman ruins in England’s Lake District are 2,000 years old, but look pretty good for their age.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

A remarkable medieval structure born from a 14th-century disaster.

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

The ancestral home of beloved English poet Lord Byron has a bizarre history.

The ruins of an 11th-century Norman castle with a rare, perfectly circular shape.